<template>
	<view class="uni-stat__select">
		<span v-if="label" class="uni-label-text hide-on-phone">{{ label + '：' }}</span>
		<view class="uni-stat-box" :class="{ 'uni-stat__actived': current }">
			<view class="uni-select" :class="{ 'uni-select--disabled': disabled }">
				<view class="uni-select__input-box" @click="toggleSelector">
					<view v-if="current" class="uni-select__input-text">{{ current }}</view>
					<view v-else class="uni-select__input-text uni-select__input-placeholder">{{ typePlaceholder }}</view>
					<view v-if="current && clear && !disabled" @click.stop="clearVal">
						<uni-icons type="clear" color="#c0c4cc" size="24" />
					</view>
					<view v-else>
						<uni-icons :type="showSelector ? 'top' : 'bottom'" size="14" color="#999" />
					</view>
				</view>
				<view class="uni-select--mask" v-if="showSelector" @click="toggleSelector" />
				<view class="uni-select__selector" v-if="showSelector">
					<view class="uni-popper__arrow"></view>
					<scroll-view scroll-y="true" class="uni-select__selector-scroll">
						<view class="uni-select__selector-empty" v-if="mixinDatacomResData.length === 0">
							<text>{{ emptyTips }}</text>
						</view>
						<view v-else class="uni-select__selector-item" v-for="(item, index) in mixinDatacomResData"
							:key="index" @click="change(item)">
							<text :class="{ 'uni-select__selector__disabled': item.disable }">{{ formatItemName(item)
							}}</text>
						</view>
					</scroll-view>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
/**
 * DataChecklist 数据选择器
 * @description 通过数据渲染的下拉框组件
 * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
 * @property {String} value 默认值
 * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
 * @property {Boolean} clear 是否可以清空已选项
 * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
 * @property {String} label 左侧标题
 * @property {String} placeholder 输入框的提示文字
 * @property {Boolean} disabled 是否禁用
 * @event {Function} change  选中发生变化触发
 */

export default {
	name: "uni-data-select",
	mixins: [uniCloud.mixinDatacom || {}],
	props: {
		localdata: {
			type: Array,
			default() {
				return []
			}
		},
		value: {
			type: [String, Number],
			default: ''
		},
		modelValue: {
			type: [String, Number],
			default: ''
		},
		label: {
			type: String,
			default: ''
		},
		placeholder: {
			type: String,
			default: '请选择'
		},
		emptyTips: {
			type: String,
			default: '无选项'
		},
		clear: {
			type: Boolean,
			default: true
		},
		defItem: {
			type: Number,
			default: 0
		},
		disabled: {
			type: Boolean,
			default: false
		},
		// 格式化输出 用法 field="_id as value, version as text, uni_platform as label" format="{label} - {text}"
		format: {
			type: String,
			default: ''
		},
	},
	data() {
		return {
			showSelector: false,
			current: '',
			mixinDatacomResData: [],
			apps: [],
			channels: [],
			cacheKey: "uni-data-select-lastSelectedValue",
		};
	},
	created() {
		this.debounceGet = this.debounce(() => {
			this.query();
		}, 300);
		if (this.collection && !this.localdata.length) {
			this.debounceGet();
		}
	},
	computed: {
		typePlaceholder() {
			const text = {
				'opendb-stat-app-versions': '版本',
				'opendb-app-channels': '渠道',
				'opendb-app-list': '应用'
			}
			const common = this.placeholder
			const placeholder = text[this.collection]
			return placeholder ?
				common + placeholder :
				common
		},
		valueCom() {
			// #ifdef VUE3
			return this.modelValue;
			// #endif
			// #ifndef VUE3
			return this.value;
			// #endif
		}
	},
	watch: {
		localdata: {
			immediate: true,
			handler(val, old) {
				if (Array.isArray(val) && old !== val) {
					this.mixinDatacomResData = val
				}
			}
		},
		valueCom(val, old) {
			this.initDefVal()
		},
		mixinDatacomResData: {
			immediate: true,
			handler(val) {
				if (val.length) {
					this.initDefVal()
				}
			}
		}
	},
	methods: {
		debounce(fn, time = 100) {
			let timer = null
			return function (...args) {
				if (timer) clearTimeout(timer)
				timer = setTimeout(() => {
					fn.apply(this, args)
				}, time)
			}
		},
		// 执行数据库查询
		query() {
			this.mixinDatacomEasyGet();
		},
		// 监听查询条件变更事件
		onMixinDatacomPropsChange() {
			if (this.collection) {
				this.debounceGet();
			}
		},
		initDefVal() {
			let defValue = ''
			if ((this.valueCom || this.valueCom === 0) && !this.isDisabled(this.valueCom)) {
				defValue = this.valueCom
			} else {
				let strogeValue
				if (this.collection) {
					strogeValue = this.getCache()
				}
				if (strogeValue || strogeValue === 0) {
					defValue = strogeValue
				} else {
					let defItem = ''
					if (this.defItem > 0 && this.defItem <= this.mixinDatacomResData.length) {
						defItem = this.mixinDatacomResData[this.defItem - 1].value
					}
					defValue = defItem
				}
				if (defValue || defValue === 0) {
					this.emit(defValue)
				}
			}
			const def = this.mixinDatacomResData.find(item => item.value === defValue)
			this.current = def ? this.formatItemName(def) : ''
		},

		/**
		 * @param {[String, Number]} value
		 * 判断用户给的 value 是否同时为禁用状态
		 */
		isDisabled(value) {
			let isDisabled = false;

			this.mixinDatacomResData.forEach(item => {
				if (item.value === value) {
					isDisabled = item.disable
				}
			})

			return isDisabled;
		},

		clearVal() {
			this.emit('')
			if (this.collection) {
				this.removeCache()
			}
		},
		change(item) {
			if (!item.disable) {
				this.showSelector = false
				this.current = this.formatItemName(item)
				this.emit(item.value)
			}
		},
		emit(val) {
			this.$emit('input', val)
			this.$emit('update:modelValue', val)
			this.$emit('change', val)
			if (this.collection) {
				this.setCache(val);
			}
		},
		toggleSelector() {
			if (this.disabled) {
				return
			}

			this.showSelector = !this.showSelector
		},
		formatItemName(item) {
			let {
				text,
				value,
				channel_code
			} = item
			channel_code = channel_code ? `(${channel_code})` : ''

			if (this.format) {
				// 格式化输出
				let str = "";
				str = this.format;
				for (let key in item) {
					str = str.replace(new RegExp(`{${key}}`, "g"), item[key]);
				}
				return str;
			} else {
				return this.collection.indexOf('app-list') > 0 ?
					`${text}(${value})` :
					(
						text ?
							text :
							`未命名${channel_code}`
					)
			}
		},
		// 获取当前加载的数据
		getLoadData() {
			return this.mixinDatacomResData;
		},
		// 获取当前缓存key
		getCurrentCacheKey() {
			return this.collection;
		},
		// 获取缓存
		getCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			return cacheData[name];
		},
		// 设置缓存
		setCache(value, name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			cacheData[name] = value;
			uni.setStorageSync(this.cacheKey, cacheData);
		},
		// 删除缓存
		removeCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			delete cacheData[name];
			uni.setStorageSync(this.cacheKey, cacheData);
		},
	}
}
</script>

<style lang="scss">
$uni-base-color: #6a6a6a !default;
$uni-main-color: #333 !default;
$uni-secondary-color: #909399 !default;
$uni-border-3: #e5e5e5;


/* #ifndef APP-NVUE */
@media screen and (max-width: 500px) {
	.hide-on-phone {
		display: none;
	}
}

/* #endif */
.uni-stat__select {
	display: flex;
	align-items: center;
	// padding: 15px;
	/* #ifdef H5 */
	cursor: pointer;
	/* #endif */
	width: 100%;
	flex: 1;
	box-sizing: border-box;
}

.uni-stat-box {
	width: 100%;
	flex: 1;
}

.uni-stat__actived {
	width: 100%;
	flex: 1;
	// outline: 1px solid #2979ff;
}

.uni-label-text {
	font-size: 14px;
	font-weight: bold;
	color: $uni-base-color;
	margin: auto 0;
	margin-right: 5px;
}

.uni-select {
	font-size: 14px;
	box-sizing: border-box;
	border-radius: 4px;
	padding: 0 5px;
	padding-left: 10px;
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	user-select: none;
	/* #endif */
	flex-direction: row;
	align-items: center;
	border-bottom: solid 1px $uni-border-3;
	width: 100%;
	flex: 1;
	height: 35px;
	color: #000;
	font-weight: 800;

	&--disabled {
		background-color: #f5f7fa;
		cursor: not-allowed;
	}
}

.uni-select__label {
	font-size: 16px;
	// line-height: 22px;
	height: 35px;
	padding-right: 10px;
	color: $uni-secondary-color;
}

.uni-select__input-box {
	height: 35px;
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	align-items: center;
}

.uni-select__input {
	flex: 1;
	font-size: 14px;
	height: 22px;
	line-height: 22px;
}

.uni-select__input-plac {
	font-size: 14px;
	color: $uni-secondary-color;
}

.uni-select__selector {
	/* #ifndef APP-NVUE */
	box-sizing: border-box;
	/* #endif */
	position: absolute;
	top: calc(100% + 12px);
	left: 0;
	width: 100%;
	background-color: #FFFFFF;
	border: 1px solid #EBEEF5;
	border-radius: 6px;
	box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
	z-index: 3;
	padding: 4px 0;
}

.uni-select__selector-scroll {
	/* #ifndef APP-NVUE */
	max-height: 200px;
	box-sizing: border-box;
	/* #endif */
}

/* #ifdef H5 */
@media (min-width: 768px) {
	.uni-select__selector-scroll {
		max-height: 600px;
	}
}

/* #endif */

.uni-select__selector-empty,
.uni-select__selector-item {
	/* #ifndef APP-NVUE */
	display: flex;
	cursor: pointer;
	/* #endif */
	line-height: 35px;
	font-size: 14px;
	text-align: center;
	/* border-bottom: solid 1px $uni-border-3; */
	padding: 0px 10px;
}

.uni-select__selector-item:hover {
	background-color: #f9f9f9;
}

.uni-select__selector-empty:last-child,
.uni-select__selector-item:last-child {
	/* #ifndef APP-NVUE */
	border-bottom: none;
	/* #endif */
}

.uni-select__selector__disabled {
	opacity: 0.4;
	cursor: default;
}

/* picker 弹出层通用的指示小三角 */
.uni-popper__arrow,
.uni-popper__arrow::after {
	position: absolute;
	display: block;
	width: 0;
	height: 0;
	border-color: transparent;
	border-style: solid;
	border-width: 6px;
}

.uni-popper__arrow {
	filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
	top: -6px;
	left: 10%;
	margin-right: 3px;
	border-top-width: 0;
	border-bottom-color: #EBEEF5;
}

.uni-popper__arrow::after {
	content: " ";
	top: 1px;
	margin-left: -6px;
	border-top-width: 0;
	border-bottom-color: #fff;
}

.uni-select__input-text {
	// width: 280px;
	width: 100%;
	color: $uni-main-color;
	white-space: nowrap;
	text-overflow: ellipsis;
	-o-text-overflow: ellipsis;
	overflow: hidden;
}

.uni-select__input-placeholder {
	color: $uni-base-color;
	font-size: 12px;
}

.uni-select--mask {
	position: fixed;
	top: 0;
	bottom: 0;
	right: 0;
	left: 0;
	z-index: 2;
}
</style>
